gistfile1.diff

diff --git a/src/util/lang.js b/src/util/lang.js
index e3405e9..539b490 100644
--- a/src/util/lang.js
+++ b/src/util/lang.js
@@ -4,7 +4,8 @@
 
 define( [], function(){
 
-  var DEFAULT_TRANSITION_TIMEOUT = 15;
+  var _transitionEndWrapperFn,
+      DEFAULT_TRANSITION_TIMEOUT = 15;
 
   // Detects if this browser supports CSS3 Transitions
   var TRANSITIONS_SUPPORTED = (function() {
@@ -12,13 +13,23 @@ define( [], function(){
         p,
         supported = false,
         pre = [ "ms", "O", "Webkit", "Moz", "" ];
+
+    // Set default fallback behaviour
+    _transitionEndWrapperFn = function( element, listener ) {
+      setTimeout( listener, DEFAULT_TRANSITION_TIMEOUT );
+    };
+
+    // Check for CSS3 Transition Support, and update wrapper function appropriately
     for ( p in pre ) {
       if ( div.style[ pre[ p ] + "Transition" ] !== undefined ) {
-        supported = true;
+        _transitionEndWrapperFn = function( element, listener ) {
+          element.addEventListener( "transitionend", listener, false );
+          element.addEventListener( "oTransitionEnd", listener, false );
+          element.addEventListener( "WebkitTransitionEnd", listener, false );
+        };
         break;
       }
     }
-    return supported;
   }());
 
   return {
@@ -110,15 +121,7 @@ define( [], function(){
       return fragment;
     },
 
-    transitionEndWrapper: function( element, listener ) {
-      if ( TRANSITIONS_SUPPORTED ) {
-        element.addEventListener( "transitionend", listener, false );
-        element.addEventListener( "oTransitionEnd", listener, false );
-        element.addEventListener( "WebkitTransitionEnd", listener, false );
-      } else {
-        setTimeout( listener, DEFAULT_TRANSITION_TIMEOUT );
-      }
-    }
+    transitionEndWrapper: _transitionEndWrapperFn
 
   };